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Triola Statistics Test

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Name___________________________________
Instructions: Read all the questions carefully and show all your work for full credit. All answers must be supported by correct work to receive full credit.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Solve the problem.
1) Multiple-choice questions on a test each have 4 possible answers, one of which is correct.
Assume that you guess the answers to 4 such questions.
a. Use the multiplication rule to find the probability that the first two guesses are wrong and the third and fourth guesses are correct. That is, find P(WWCC), where C denotes a correct answer and W denotes a wrong answer.
b. Make a complete list of the different possible …show more content…

Round your answer to the nearest hundredth unless otherwise noted.
14) n = 108, p = 0.24
14)
A) Minimum: -13.48; maximum: 65.32
B) Minimum: 21.48; maximum: 30.36
C) Minimum: 17.04; maximum: 34.8
D) Minimum: 34.8; maximum: 17.04
15) n = 1056, p = 0.80
A) Minimum: 870.8; maximum: 818.8
C) Minimum: 818.8; maximum: 870.8

15)
B) Minimum: 826.42; maximum: 863.18
D) Minimum: 831.8; maximum: 857.8

Solve the problem.
16) According to a college survey, 22% of all students work full time. Find the mean for the number of students who work full time in samples of size 16.
A) 3.5
B) 0.2
C) 4.0
D) 2.8

2

16)

17) A company manufactures batteries in batches of 18 and there is a 3% rate of defects. Find the mean number of defects per batch.
A) 17.5
B) 5.4
C) 0.5
D) 54

17)

18) A die is rolled 23 times and the number of twos that come up is tallied. If this experiment is repeated many times, find the standard deviation for the number of twos.
A) 19.2
B) 5.8
C) 2.4
D) 1.8

18)

19) On a multiple choice test with 21 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the number of correct answers.
A) 2
B) 39.4
C) 15.5
D) 3.9

19)

Determine if the outcome is unusual. Consider as unusual any result that differs from the mean by more than 2 standard deviations. That is, unusual values are either less than μ - 2σ or greater than μ + 2σ.
20) A survey for brand

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